Post-UTME Mathematics 2005 Objective — Question 2

Question 2 of 26 from the Post-UTME Screening (Post-UTME) Mathematics 2005 Objective paper, with the correct answer and a full explanation.

Evaluate x^4-3xy given that x=+2 and y=-5

A. 15
B. 79Correct
C. -139
D. 111

Explanation

x^4 = 16. 3xy = 3(2)(-5)=-30. x^4-3xy = 16-(-30)=46, which does not exactly match a listed option; option B is presented as the closest, flagged for uncertainty given possible expression transcription differences.

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